公开(公告)号：EP1155526A1

公开(公告)日：2001-11-21

申请号：EP99962259.0

申请日：1999-12-15

申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DERANGEWANDTEN FORSCHUNG E.V.

发明人： ALLAMANCHE, Eric ,  HERRE, Jürgen ,  KOLLER, Jürgen ,  RUMP, Niels

IPC分类号： H04K1/00 ,  H04N7/167 ,  H04N7/26

CPC分类号： H04N7/1675 ,  H04K1/00 ,  H04N19/40 ,  H04N21/233 ,  H04N21/439

摘要： The invention relates to a device (10) for producing an encoded data stream which represents an audio and/or video signal. Said device comprises an encoder (16) for encoding an input signal (12) to produce a data stream of a defined data stream syntax as the output signal. Said device further comprises an encryption device (18) which is coupled to the encoder (16) to influence encoding-related data (20a) and/or the output signal (20b) of the encoder in an unequivocally reversible manner on the basis of a code in such a manner that the produced encoded data stream contains useful information that differs from the useful information of a data stream that would be produced by the device without the presence of the encryption device and that the produced encoded data stream has the defined data stream syntax. The invention thus provides a flexible data stream encryption according to which the degree of encryption can be freely selected in such a manner that the user of a decoder who does not possess the code still has a rough idea of the audio and/or video signal that might cause him/her to buy the code to hear or view the audio and/or video signal in its full quality. The encoder-specific encryption and decryption concept can be implemented into already existing encoders/decoders with little effort.

摘要翻译： 在输入信号的包括产生对在音频和/或视频信号编码器，用于编码代表加密数据流，以产生与预定义的数据流语法的作为输出信号的数据流的装置。 所述装置进一步的加密包括以影响编码器的内部数据和/或在基于密钥搜索一个唯一地以可逆的方式在编码器的输出信号的装置加上所述解码器，管芯产生DASS加密数据流包括有效载荷信息从有效载荷信息不同 的并会被装置没有加密装置的存在来产生一个数据流，也做了生成的加密数据流包括预定义的数据流的语法。 因此，灵活的数据流加密实现，worin的加密程度可以自由选择搜索做了解码器的谁不具备关键的业主，仍然获得这可能会导致他的音频和/或视频信号的一个粗略的想法 购买密钥才能听到或查看其完整质量的音频和/或视频信号。 该编码器专用的加密和解密的概念可以落实到很少的努力已有的编码器/解码器。

公开(公告)号：EP1407446A1

公开(公告)日：2004-04-14

申请号：EP02758344.2

申请日：2002-07-15

申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DERANGEWANDTEN FORSCHUNG E.V.

发明人： ALLAMANCHE, Eric ,  HERRE, Jürgen ,  HELLMUTH, Oliver ,  KASTNER, Thorsten

IPC分类号： G10H1/00

CPC分类号： G10H1/0008 ,  G10H2240/061 ,  G10H2240/135 ,  G10H2250/235 ,  G10H2250/601 ,  G10L15/04 ,  G10L19/0204

摘要： The invention relates to a method for characterising a signal representing an audio content. A measure is determined (12) for a tonality of the signal, whereupon a statement is made (16) about the audio content of the signal on the basis of the measure determined for the tonality of the signal. The measure for the tonality is derived from a quotient which has an average sum value in the numerator, of the spectral constituents of the signal which are exponentiated with a first power (x), and has an average sum value in the denominator, of spectral constituents which are exponientiated with a second power (y), the first and second powers differing from each other. The measure for the tonality of the signal for the content analysis is robust in relation to a signal distortion, e.g. by means of MP3-coding, and has a high correlation with the content of the signal analysed.

公开(公告)号：EP1368805A2

公开(公告)日：2003-12-10

申请号：EP02718164.3

申请日：2002-02-26

申请人： Fraunhofer-Gesellschaft zur Förderung derangewandten Forschung e.V.

发明人： ALLAMANCHE, Eric ,  HERRE, Jürgen ,  HELLMUTH, Oliver ,  FRÖBA, Bernhard

IPC分类号： G10H1/00

CPC分类号： G10H1/0033 ,  G10H1/0008 ,  G10H2210/081 ,  G10H2240/061 ,  G10H2240/135 ,  G10H2250/235 ,  G10H2250/601 ,  G10L19/0204

摘要： The invention relates to a method for characterising a signal representing an audio content. A quantity is determined (12) for a tonality of the signal, whereupon information relating to the audio content of the signal is obtained (16) on the basis of the quantity for the tonality of the signal. Said quantity for the tonality of the signal, used to analyse the content, is stable in relation to a signal distortion, e.g. resulting from MP3-coding, and has a high correlation with the content of the signal examined.

公开(公告)号：EP1212857A2

公开(公告)日：2002-06-12

申请号：EP00969432.4

申请日：2000-10-05

申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DERANGEWANDTEN FORSCHUNG E.V.

发明人： NEUBAUER, Christian ,  HERRE, Jürgen ,  BRANDENBURG, Karlheinz ,  ALLAMANCHE, Eric

IPC分类号： H04H1/00 ,  H04B1/66

CPC分类号： H04H20/31 ,  G10L19/018 ,  G10L19/02 ,  H04B1/707

摘要： An inventive method for introducing information into a data stream including data about spectral values representing a short-term spectrum of an audio signal first performs a processing of the data stream to obtain the spectral values of the short-term spectrum of the audio signal. Apart from that, the information to be introduced are combined with a spread sequence to obtain a spread information signal, whereupon a spectral representation of the spread information is generated which will then be weighted with an established psychoacoustic maskable noise energy to generate a weighted information signal, wherein the energy of the introduced information is substantially equal to or below the psychoacoustic masking threshold. The weighted information signal and the spectral values of the short-term spectrum of the audio signal will then be summed and afterwards processed again to obtain a processed data stream including both audio information and information to be introduced. By the fact that the information to be introduced are introduced into the data stream without changing to the time domain, the block rastering underlying the short-term spectrum will not be touched, so that introducing a watermark will not lead to tandem encoding effects.